RFR: 1983 Handle multiple include paths

[Ludvig Janiuk]

Add the --get-all flag to handle the case where a user has multiple values for include.path

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Commit messages:
 - 1983 Handle multiple include paths

Changes: https://git.openjdk.org/skara/pull/1540/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1540&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1983
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1540.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1540/head:pull/1540

PR: https://git.openjdk.org/skara/pull/1540